Controlling device for electric motors.



, '-P. H. ZIMMER.

f GONTROLLINGDEVICE POR ELECTRIC MOTORS.

APPLICATION FILED APR. 10, 1908.

Patented Dec. 31,1912.

lnvantor+` Paul H Zmme T my WiJGryesses:

UNTTED STATES PATENT OFFICE.

. BAUL H. ZIMMER, OF SCHENECTADY, NEW YORK, ASSIG-NOR TO GENERAL ELECTRIC COMPANY, A CORPORATION F NEW YORK.

CONTROLLING DEVICE FOR ELECTRIC MOTORS.

Specification of Letters atent.

Pamnfeanee. 31.1912

Application tiled April 10, 1908. Serial No. 426,204

To 0.17. whom it may concern.'

Be it known that. I. PAUL H. Zinnen, a citizen of the vUnited States, residing' at Schenectady, in the count-y of Schenectady, State oflei'v York, have invented certain new and useful inproveii'ients in Controlling Devices for lllectiic`Moters, of which the 'following is a specification.'

This invention relates to means for controlling electric motor circuits and has t'or its object the provision of av device of this character whereby an electric motor may be stopped. started and generally controlled in a reliable and efficient manner.

Mv invention relates more.; specifically to devices for controlling motors from a remote point, as for instance by the operation of push buttons or switches located atA convenient points. Starting devices of this type are of partienlar service in connection -with the opera-tion of printingr presses.

One of the objects of my invetionisto provide a. controller of this type which may be operated step by step in either direction so as to either accelerate or .retard the speed of thc motor, the arrangement being -snch 'that the motor may be maintained at any desired speed. I also provide means Whereby the niotor may be instantly stopped and the controlling mechanism brought backto starting position.

In the accompanying 'drawing I have shown-my invention embodied in concrete mechanism', the arrangement ot circuits lieinQ likewise shown in tlie drawinff.

Referring: to the drawing. 1 is a base or panel' board of insulating' material, which is slate or scansione, having mounted thereon a. series of Contact studs 2 forming termina-ls for armature resistance 3 and aseries of studs 4, forming,Y the terminals of' iield resistance A plurality of reversing studs 6 are arranged coneentrically with studs 52 and are crossconnected with the armature resistance as slio\vii. These studs f1 are separated from the studs Q by insulating" studs 7 and a conductinastud 8. Contact segment?) is arranged concentrically with the studs and segment 10 is similarly arranged with reference to the studs` 2. Con-Vv ducting segments l11, 12,13 and 14 are arranged as, shown cross-connected for purposes hereinafter set forth, contact stud 1T sion .or bias. being located between segments ll. and 14. g 'tlieeiect of the spring 'An operatlng Wheel ordisl; 1 6 pivgted at arm or member 18 adapted to cooperateV with the aforesaid ,contacts Thisarm is provided With a contact. 19 electric-ally connected Vtherewith for engaging the segment 9 and'stiids 4, and ay similarly arranged contact 20 for engaging the contact segments 12 and 13. A bridging contact 21 is mounted upon the arm, but insulated therefrom so as to bridge the studs, 6, S and 2, as well as the segment 10 with the segments 11 and 1-1, and stud 15. The disk 16 is biased tothe position shown in the drawing.,r by means ot a double-acting spring' 22. An actuating` arm 23 is pivoted at 17 and has pivoted thereto pavvls 241. having their free ends spring-pressed together by means of a spring 25. These pawls are normally springp1'essed aL'ainst the pin 26 secured to the slate base. The free ends of the pawls are tapered as .shown and arranged to engage the edge of the disk 16, the surface of which may be prepared in any desired Way so as to otter a goed gripping surface for the pawls. The arrangement is snch tliatvwhen the arm is moved in either direction the paWl arranged on the side of the arm toward which the arm is moved will engage the disk and move the saine While the other pavv'l will be moved away from the disk by the pin 2G and the spring` S25 placed under tension. The arm Q8 has a pin and slot connection with the core 27 which coperates at either end with the solenoids Q8 and 29. The arm Q3 has an insulating projection 30 adaptedto cn' gage the switch arms'Bl and 32 which are Sprin;ipressed to the position shown against the conducting pins 33 and 34 respectively.

These switches control'the circuits of the solenoids 28 and 29 so as to give the arm V'23 a vibratory movement, whichin turn advances the disk 16 step by step in either di rectioii depending upon which one of the soleiioids is energized. The solenoid 28 is controlled by a normally open switch 0r push button While solenoid 29 is conarranged push buttrolled by' a similarly In order that the controlling'iarm 18 may be left iii any intermediate position lduring normal operation I provide means vvfhereby the arm may be relieved of the spring tenhy means offa band This is done by counteracting Y pivoted at. 46 and havinga contact 46 at its free end coiperating with the fixed Contactv 47 to close the armature circuit. The lever 40 is pressed to the positionshown b v means of the spring The holdinu coil 44 is controlled by a normally closed switch or push button 48, and a pair of limit switches 49 and 5() are arranged at the limit ofv tra-vel of the arm 18 in either direction so as to automatically interrupt the circuit of the solenoids.

The arrangement of circuitsvand mode of f operation are as follows: 'Vhen it is desired to start the motor in either direction, push button'b is pressed whereupon the arm 18 given a step lby step motion in a clock` wise direction over the studs 2. lVhen the switch is closed the actuating coil 43 is energized through the conductors 51 and 52. stud 15. bridging contact Q1, stud 8 and conductor vback to the negative main.

The holding coil 44 is connected across the line through button 48 as shown. Coils 43 and 44 being energized the lever 40 is actuated whereupon the band brake 3T is applied to the brake wheel S8. the teiision'being just sufficient to overcome the tension of the spring 22. At the same time 'the circuit of solenoid 28 is closed at the contacts 46 and 4T, the circuit of the solenoids beingl as follows: from the positive main, solenoid 28. switch arm 32. conductor 54,- limit switch 50, conductor 55, contacts 46. and 47,-conduetor 56 and back to the negative main. The arm 18 is thus moved step by step in a clockwise direction` the circuitof theA solenoid 28 being opened and closed as `above described at pin 33 each time the arm is moved far enough for the projection 30'to engage switch 82. When the arm 18 is moved so that lthe contact Q0 engages the segment 13, the armature circuit is closed as follows: from the positive main'to the pivotal point 17, segment 13, segment 11 .through armature A, conductor 57, segments 12 and 14, bridging contact 21, resistance 3, conductor 55, contacts 46 and 4 7, conductor 56 and back to the negative main. As long as the push button 35 is closed the arm 18 will continue to move over the studs 2 to cut. out armature resistance'and thereby speed up the motor. When the switch 35- 1s opened the arm will'rem'ain where it is left so that vthe motor can be run at any .speed desired. To operate -the armglS 'in a counter-clockwise*direction inra step liyfstepA movement, push button 36 is pressed wheres" upon solenoid 29 is energized and the mech'- anism operates as above described. If the arm is moved in a counter-clockwise direction on to 4the ,studs 6, the motor will be reversed b iit in order` to reverse from the 7G be in any position on either side of the central or normal position. the motor may be quickly stopped and the arm brought to the normal position by pressing button 48.

`rThis-will denergize the holding 'coil 44 which will open the armature circuit at 46 85 and 47, and at the same time release the band brake from the disk 16, which will immediately return in, response to the spring tension -to its normal position. When the arm is moved to the limit of its travel in either direction, the circuit will be opened at the limit switches 49 and 50 and the arm will remain in this position until one of theJT other buttons is operated to return it.

It' will thus be seen that I have provided 95 a simple and etlicient mechanism whereby the speed of the motor in either direction may be controlled throughout. a wide range by simply operating push buttons arranged at a distance from the controlling mechanis-in. vThe arm mayr be moved in either direction step by step and when it is desired will be returned quickly in response to the spring to starting position. -Furthermorc the armature circuit cannot be closed until the controlling arm is in the starting position.

While I have described my invention in connection with a specific structure and ino-de of operation, itshould be understood that I'do not limit my invention in' theseparticulars exceptI in so far as it is limited by the scope ofthe claims annexed hereto What cla-im as new and desire to secure by Letters Patent of the United States, is-

1. A controlling device for electric motors comprising a resistance. a controlling member therefor biased to an' initial position, electromagnetic means for operating said member in two direetionsto vary t-he resistance, andY electrically controlled means whereby7 the effect cfs-aid. bias is counteracted and the member'flleft movable in either direction. f

2. A controlling device -for electric motors comprising a resist-ance, a controlling meinber. therefor' biased to an intial position, electromagnetic means 'for operating said 4'member in two directions to v ary the resistance, `'tired an electromagnetic device ar- 13g ranged to counteract the effect ot the bias or" said member and simultaneously energize said operating means. v

il. A controlling device for electric motors -omprising a resistance, a controlling member therefor, electromagnetic means for operating said member in tivo directions to var v Athe resistance, and an electromagnetic devicearranged to close the motor circuit through said resistance and simult-aneously counteract the ettect of the bias on said member.

el. A controlling device for elect-ric motors comprising a resistance, a controlling member theret'or biased to an initial position, electromagnetic means for operating said member in two directions to vary the resistance. and an electromagnetic device arranged to counteract the ettect ot the bias on said member and simultaneously close the motor circuit through the resistance and energiz.; the operating means.

5. A controlling device for electric motors comprising a resistance, a controlling member therefor biased to an initial position. electromagnetic means for operating said member to vary the resistance and an electromagnetic d viec arranged to counteract the ett'ect ot the bias on said member and simultaneously close the motor circuit throug'h the resistance and energize the operating means.

t3. controlling device for electric motors comprising a resistance, a controlling member therefor having a bias to an initial position, electromagnetic means for operating said member in two directions to vary the resistance, an electromagnetic device arranged to close the motor circuit through said resistance and simultaneously counteract the effect of thebias on said member, and a normally-closed switch for controlling said device.

T. .l controlling device for electric motors comprising a resistance, a controlling member therefor biased to an initial posit-ion, electromagnetic means for operating said member in two directions to vary the resistance, an electromagnetic device arranged to ,counteract the effectof the bias on said member and simultaneously energize said operating meansr; and a normally-open switch controlling said device.

N. .t controlling device for electric motors comprisinoj a resistance, -a controlling member theretor biased to an initial position. elertromagi'wtic means tor operating said member to vary the resistance. an electromagnetic device arranged to counteract the etleet ot the bias on-said member, and a normally-open switch controlling said dcvire and said operating means. e

il. controlling device for electric motors comprising a resistance. a controlling member therefor. electromagnetic means for operating said men'iber in two directions to vary the resistance, an electromagnetic switch arranged to close the motor circuit. through said resistance having an actuating coil and a holding coil, and a normally-open switch controlling said actuating coil and the operating means.

l0. A controlling device for electric motors comprising a resistance, a controlling member therefor' having a bias to an initial position, electromagnetic means for operating said .member to vary the resistance, an electromagnetic device having an actuating coil and a holding coil arranged to close the motor circuit through said resistance and Simultaneously counteract the effect ot the bias yon said member, and a normally-open switch controlling said actuating coil and said operating means. n

1l. A `controlling device :tor electric motors comprising a resistance, a controlling member therefor biased to an initial position, electromagnetically-actuated mechanism-tor operating said member step by step in two directions to vary the resistance, an electromagnetic device arranged to counteract the effect of the bias on said member., and a switch for controlling said device and said operating means. I

l2. A controlling device for electric motorscomprising a resistance,- a' controlling member therefor biased to an initial Vposition, electromagnetically actuated mechanism for operating said member step by step to vary the resistance, an electromagnetic device arranged to counteract Vthe etl'ect of the bias on said member and simultaneously close the motor circuit through said resistance, and a switch for contro-lling said device and said operating means.

13. .A controlling device for electric nio-- tors comprising a resistance, a. controlling member therefor biased to an initial position, electromagnetically-actuated 4mechanism for operating said member step by step to vary the resistance, an electromagnetic device having an actuating coil and a. holding coil arranged to counteract the effect of the bias on said member and simultaneously close the motor circuit through said resistalice, and a normally-open switch tor controlling said operating means and-said actuating coil;

14. A controlling device tor electric m0- tors comprising a resistance, la controlling member therefor biased to an initial position, electromagnetically-actitated mechanism for operating said member stepby step -in tivo directions to vary the resistance, an electromagnetic device having an actuating coil and a holding coil arranged to c nmteract the ettect of the. bias on sa'd member and simultaneously close the motor' circuit through said resistance. a normally-open switch for controlling said operating means :md said actuating coil, and a normallyclosed switch for controlling the, holding coil.

15. A controlling device for electric motors comprising a resistance controlling member, electromagnetic means' for operating the same in two directions, a switch forl member, electromagnetic means for operating the same in two directions, a switch for 15 energizing said means in each direction, and a stopping switch for returning the mem-v ber to initial position 'independentl of the other switches, saidV switch after it' as once been operated having no further control 20 over the member. f In Witness whereof, I have hereunto jmy hand this 8th day of April, .1908.

PAUL H. ZIMMER.

.Vitnesses I l HELEN ORFORD, BexJAniN B. HULL.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, '.D. C. 

